Often called the southernmost trekking route in the world, the Dientes is a five-day, 50km odyssey up and down mountainous terrain and subpolar forests and looping around the otherworldly riches of the very end of the Andes mountain range. Each day of the circuit has only 10km of walking, but the terrain can be quite challenging, with steep, rocky mountainsides and muddy, boggy spots. Equipment, experience, preparation and willpower are essential. Navarino weather is even more unpredictable than Ushuaia weather, so adventurers should be ready for snow, heat, rain and sleet – sometimes in the same day! There are no shelters, only campsites; make sure to pack a GPS – you can rent one from Comercial Antártica (comercial-antartica.cl) in Puerto Williams – and a satellite-enabled phone. Tour operators like Errante Ecolodge (errantecolodge.com/home) and Explora Isla Navarino (exploraislanavari